The causes of high heart rate after nap should be considered as phytoneurological disorder, endocrine disease, infectious disease, heart disease and so on. 1. Phytoneurological disorders: patients with phytoneurological disorders may cause tachycardia after nap. 2. Endocrine metabolic diseases: such as hyperthyroidism, hyperadrenocorticism, may also have rapid heartbeat after nap. 3. Infectious diseases: such as bacteria, viruses, mycoplasma infection of the human body, the human body will appear to increase body temperature, will be in the afternoon after the nap body temperature rise is particularly obvious, this time due to the rise in body temperature and lead to rapid heartbeat. 4. Organic heart disease: such as coronary heart disease, myocarditis, pericarditis, heart valve disease, congenital heart disease, hypertrophic obstructive cardiomyopathy, there will also be arrhythmia. Therefore, the etiology of the increased heart rate after nap is very complex, and needs to be combined with the patient’s medical history examination, to clarify the specific causes of the disease, so as to target the treatment.